RennanMendes/ems-algashop-ordering ? reverse-engineered prompt

Build me the ordering part of a small shopping system for AlgoShop.

I want a Java service that lets me create an order, add items to it, see the order details, and update the order status as it moves through the process. Keep it simple and practical, like a backend someone could plug into a larger store app. If it makes sense, include a few basic endpoints for creating and fetching orders, plus some sample data so I can try it right away.

Make the code clean and easy to understand, with sensible validation and a straightforward structure. If you need to look up current docs online to get the setup right, go ahead. I’d also like a few tests so I can be confident the main flows work.